arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.01449cond-mat.mes-hallcond-mat.mtrl-sci
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金属薄膜中的可调谐等离子体激元

Tunable plasmons in ultrathin metal films

Rinu Abraham Maniyara, Daniel Rodrigo, Renwen Yu, Josep Canet-Ferrer, Dhriti Sundar Ghosh, Ruchirej Yongsunthon, David E. Baker, Aram Rezikyan, F. Javier García… 展开作者

Rinu Abraham Maniyara, Daniel Rodrigo, Renwen Yu, Josep Canet-Ferrer, Dhriti Sundar Ghosh, Ruchirej Yongsunthon, David E. Baker, Aram Rezikyan, F. Javier García de Abajo, Valerio Pruneri

摘要:

当一个或多个维度降低到纳米尺度时,电子、光子及其等离子体相互作用的物理性质发生了巨大变化。例如,石墨烯显示出独特的电学、光学和等离子体性质,这些性质可以通过门控或化学掺杂来调节。类似地,低至原子厚度的双金属薄膜(UTMF)可以具有新的量子光学效应、奇特的介电性质和预测的强等离子体激元。然而,真正的二维金属等离子体激元迄今为止还难以实现,因为难以产生大面积的足够薄的连续膜。由于沉积技术,即使在1 nm的厚度,允许渗滤,我们展示了等离子体在几个纳米的金UTMF,新的分散制度和大的电调谐性的明确证据。在1.5-5微米波长处的共振峰被移动了数百纳米,并且通过使用相对较低的电压的选通被幅度调制了百分之几十。研究结果提出了在等离子体应用中使用金属的方法,例如电光调制,生物传感和智能窗户。

英文摘要:

The physics of electrons, photons, and their plasmonic interactions changes greatly when one or more dimensions are reduced down to the nanometer scale. For example, graphene shows unique electrical, optical, and plasmonic properties, which are tunable through gating or chemical doping. Similarly, ultrathin metal films (UTMFs) down to atomic thickness can possess new quantum optical effects, peculiar dielectric properties, and predicted strong plasmons. However, truly two-dimensional plasmonics in metals has so far elusive because of the difficulty in producing large areas of sufficiently thin continuous films. Thanks to a deposition technique that allows percolation even at 1 nm thickness, we demonstrate plasmons in few-nanometer gold UTMFs, with clear evidence of new dispersion regimes and large electrical tunability. Resonance peaks at 1.5-5 micrometer wavelengths are shifted by hundreds of nanometers and amplitude-modulated by tens of per cent through gating using relatively low voltages. The results suggest ways to use metals in plasmonic applications, such as electro-optic modulation, bio-sensing, and smart windows.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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